<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }

    </style>
</head>
<body>
    <script>
        window.onwheel = function () {
            // console.log(event.deltaY);
            if (event.deltaY > 0) {
                console.log('向下');
            } else {
                console.log('向上');
            }
        }
        var obj = {};
        console.log(obj.name);
    </script>
</body>
</html>